A Psychrometric Approach to Air-Side-Economizer Limits, Part 1 of 2

Examining the effect of economizer operation on the comfort of spaces served by constant-volume air-conditioning systems

Part 1 of this two-part article reviews the basics of air-side-economizer operation and illustrates psychrometric analysis of a small office zone.

Constant-volume air-conditioning systems control space air temperature directly and humidity indirectly by modulating or cycling the cooling apparatus. This article examines the effect of economizer operation on the comfort of spaces served by constant-volume air-conditioning systems.
As they relate to integrated operation, the ideas presented here are applicable primarily to direct-expansion (DX) systems with limited unloading capability; however, many also apply to chilled-water systems. ...

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